Surface configuration of a duffel bag



FIG. 1 is a left, front perspective view of a surface configuration of a duffel bag according to my novel design;

FIG. 2 is a front view of the surface configuration of a duffel bag according to my novel design;

FIG. 3 is a rear view of the surface configuration of a duffel bag according to my novel design;

FIG. 4 is a right side view of the surface configuration of a duffel bag according to my novel design;

FIG. 5 is a left side view of the surface configuration of a duffel bag according to my novel design; and,

FIG. 6 is a top view of the surface configuration of a duffel bag according to my novel design.

The dash lines included depict environment and are not part of the claimed design. 

The ornamental design for a surface configuration of a duffel bag, as shown and described. 